import java.util.*;
public class main{
    public static void main(String[] args) {
        try{
            int a;
            Scanner in=new Scanner(System.in);
            a=in.nextInt();
            
            in.close();
            if(a>=10000)
            	System.out.print((int)(a*0.85));
            else if(a>=1000)
            	System.out.print((int)(a*0.9));
            else if(a>=100)
            	System.out.print((int)(a*0.95));
            else 
            	System.out.print(a);		
        }catch(Exception e){
            System.out.println("Input error!");
        }
    }
};